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Texas Instruments LM5017MR/NOPB
- Part No.:
- LM5017MR/NOPB
- Manufacturer:
- Texas Instruments
- Package:
- 8-PowerSOIC (0.154", 3.90mm Width)
- Datasheet:
-
LM5017MR/NOPB.pdf
- Description:
- IC REG BUCK ADJ 600MA 8SOPWR
- Quantity:
- Payment:
- Shipping:
Inventory:7,044
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Product details
Overview
LM5017MR/NOPB from Texas Instruments is a 100-V, 600-mA synchronous buck/Fly-Buck™ regulator with integrated 100-V high-side and low-side N-channel MOSFETs, constant on-time (COT) control, no loop compensation required, and 1.225-V ±2% feedback reference. It operates across 7.5–100 V input and supports isolated bias generation in telecom and industrial PLC power supplies.
For engineers reviewing the LM5017MR/NOPB datasheet, LM5017MR/NOPB pinout, LM5017MR/NOPB application, or LM5017MR/NOPB equivalent, this device is selected for high-input-voltage DC/DC conversion where fast transient response, input voltage resilience, and Fly-Buck™ isolation capability are critical - especially in space-constrained 8-pin SO PowerPAD™ layouts.
Technical Context
The LM5017MR/NOPB implements adaptive constant on-time control where switch on-time varies inversely with VIN, enabling near-constant switching frequency (up to 1 MHz) across 7.5–100 V input without loop compensation. Its internal 7.6-V VCC regulator powers gate drivers and logic, with UVLO programmable via external resistor divider on the UVLO pin.
It integrates intelligent peak current limiting (1.02 A typ), thermal shutdown at 165°C with 20°C hysteresis, and dual-level undervoltage detection: remote shutdown activation below 0.66 V on UVLO and startup enablement above 1.225 V. The BST/SW bootstrap circuit requires a 0.01-μF ceramic capacitor for high-side gate drive.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 7.5 V to 100 V - enables direct regulation from 24 V, 48 V, PoE, and industrial HV rails without pre-regulation. |
| Output Current | 600 mA continuous - sufficient for auxiliary bias rails in PLC I/O modules and telecom secondary-side supplies. |
| Feedback Reference | 1.225 V ±2% - sets output voltage via external resistor divider; enables precise 3.3 V, 5 V, or custom outputs. |
| Switching Frequency | Adjustable up to 1 MHz - controlled by RON resistor and VIN; maintains stability across wide input range. |
| RDS(on) (High-Side) | 0.8–1.8 Ω - reduces conduction loss at 600 mA; optimized for efficiency in 48 V → 5 V conversion. |
| RDS(on) (Low-Side) | 0.45–1.0 Ω - enables synchronous rectification without external Schottky diode. |
| Thermal Shutdown | 165°C with 20°C hysteresis - protects against sustained overload or poor PCB thermal design. |
Pinout & Package
LM5017MR/NOPB is packaged in an 8-pin SO PowerPAD™ (DDA) package with 4.89 mm × 3.90 mm body size and exposed thermal pad soldered to RTN for enhanced thermal performance (RθJA = 41.1°C/W).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 RTN | Ground reference | Primary GND connection; exposed pad must be soldered to system ground plane for thermal and EMI integrity. |
| 2 VIN | Main input supply | Accepts 7.5–100 V; powers internal VCC regulator and high-voltage switches. |
| 3 UVLO | Undervoltage lockout input | Resistor-divider programmable threshold (1.225 V typ); <0.66 V forces shutdown mode. |
| 4 RON | On-time control | Resistor-to-VIN sets minimum on-time; ensures stable COT operation and frequency predictability. |
| 5 FB | Feedback input | Compares output voltage to 1.225 V reference; ripple-coupled for COT stability. |
| 6 VCC | Bias supply output | 7.6 V regulated output; powers gate drivers and internal logic; requires 1-μF decoupling. |
| 7 BST | Bootstrap supply | Connects to SW via 0.01-μF ceramic capacitor; enables floating high-side gate drive. |
| 8 SW | Switching node | Drives external inductor; connects to BST capacitor and output filter; handles full switching waveform. |
Key Features
| Feature | Design Value |
|---|---|
| Constant On-Time (COT) Control | Eliminates need for external compensation network; delivers ultra-fast load transient response in industrial automation systems. |
| Integrated Dual MOSFETs | 100-V rated high-side and synchronous low-side switches reduce BOM count and eliminate Schottky losses. |
| Fly-Buck™ Topology Support | Enables isolated DC/DC conversion without optocoupler or transformer feedback winding - ideal for telecom bias rails. |
| Programmable UVLO & Remote Shutdown | Independent threshold and hysteresis setting via UVLO pin allows flexible brown-in/brown-out behavior and system-level power sequencing. |
| Intelligent Peak Current Limit | Off-time scales with VIN and VFB - provides robust short-circuit protection up to 100 V input without excessive foldback. |
Applications
| Industrial PLC Power Supply | Smart Power Meter Auxiliary Rail |
|---|---|
|
Use Scenario: Generating isolated 5 V/3.3 V bias for analog front-end and microcontroller in DIN-rail mounted programmable logic controllers operating from 24–48 V DC bus. IC Role / Device Role / Timing Role: Primary synchronous buck controller implementing Fly-Buck™ topology to derive isolated secondary outputs without optocoupler feedback. Use Value: Eliminates need for discrete high-voltage MOSFETs and external gate drivers while maintaining >85% efficiency at 600 mA load. |
Use Scenario: Providing stable 3.3 V rail for metrology ADC, RTC, and RF communication ICs in revenue-grade smart meters powered from 100–300 V AC rectified input. IC Role / Device Role / Timing Role: High-input-voltage step-down regulator with programmable UVLO to ensure clean startup only after AC line stabilizes. Use Value: Withstands 100 V min input and delivers precise 1.225 V reference-based regulation - critical for accurate energy measurement timing. |
| Telecom Secondary-Side Bias | Isolated Industrial Sensor Interface |
|
Use Scenario: Generating +12 V and –5 V isolated bias for op-amps and line drivers in telecom base station power management units fed from 48 V backplane. IC Role / Device Role / Timing Role: Fly-Buck™ controller using coupled inductor to generate dual-polarity isolated outputs with single IC and minimal magnetics. Use Value: Achieves <1% output voltage drift over temperature and line variation - essential for signal integrity in high-speed data interfaces. |
Use Scenario: Powering isolated analog sensor signal conditioning circuits in hazardous-area field transmitters operating from 24 V loop-powered or 100 V DC bus. IC Role / Device Role / Timing Role: Synchronous buck regulator with thermal shutdown and current limiting to survive harsh environments and fault conditions. Use Value: Integrated 100-V switches and 165°C thermal cutoff prevent latch-up during surge events common in industrial 4–20 mA loop systems. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar high-voltage synchronous buck regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LM5164DRCT | 4.5–65 V input, 3.5 A output, 1.225 V reference, but no integrated low-side FET - requires external synchronous rectifier. | Better suited for higher-current non-isolated applications; lacks Fly-Buck™ capability and UVLO programmability. | Select when >600 mA output current is needed and isolation is not required. |
| MAX17681ATP+ | 4.5–60 V input, 600 mA, integrated FETs, 1.21 V reference, but no Fly-Buck™ support and fixed 400 kHz frequency. | Limited to non-isolated buck; lacks adjustable frequency and VIN-scaled on-time - less resilient to wide input swings. | Choose for cost-sensitive 24 V industrial apps where layout simplicity outweighs input voltage flexibility. |
Compared with LM5017MR/NOPB, LM5164DRCT offers higher current but requires external components for isolation and adds complexity, while MAX17681ATP+ simplifies design at the expense of input voltage headroom and topology flexibility - making LM5017MR/NOPB uniquely balanced for 100-V Fly-Buck™ and rugged industrial bias generation.
Availability
LM5017MR/NOPB is available at Aetrix Electronics and suitable for industrial programmable logic controllers (PLC), smart power meters, and telecom primary/secondary side bias applications requiring stable component supply, long-term lifecycle assurance, and traceable sourcing.
Supply support for LM5017MR/NOPB includes scheduled delivery planning, volume procurement assistance, BOM continuity management, traceable sourcing, and lifecycle availability coordination for OEM customers, industrial embedded developers, connected-device designers, and electronics production programs.
Manufacturer
Texas Instruments is a global semiconductor leader specializing in analog, embedded processing, and power management technologies with decades of high-reliability power IC development.
The LM5017MR/NOPB belongs to TI's high-voltage DC/DC regulator product line, designed specifically for industrial, telecom, and metering applications demanding wide-input operation, integrated power stages, and robust protection features.
FAQ
What is the maximum input voltage rating for the LM5017MR/NOPB?
The LM5017MR/NOPB supports a maximum input voltage of 100 V, verified per absolute maximum ratings in the official datasheet (SNVS783K). This rating applies continuously under recommended operating conditions and enables direct connection to 48 V telecom systems, 24 V industrial buses, and rectified AC inputs up to 100 V DC. Exceeding this voltage risks permanent damage to the integrated high-side MOSFET and internal regulators.
Does the LM5017MR/NOPB support Fly-Buck™ topology out of the box?
Yes, the LM5017MR/NOPB natively supports Fly-Buck™ isolated DC/DC conversion without firmware or external control logic. Its constant on-time architecture, integrated synchronous rectifier, and bootstrap gate drive enable reliable operation with coupled inductors. TI's official application circuits (e.g., Figure 2 in SNVS783K) confirm this capability for generating isolated secondary outputs in telecom and industrial bias supplies.
What is the purpose of the RON pin on the LM5017MR/NOPB?
The RON pin on the LM5017MR/NOPB sets the minimum on-time duration by connecting a resistor between RON and VIN. This resistor determines switching frequency scaling - higher RON increases on-time and lowers frequency, while lower RON enables higher frequencies up to 1 MHz. Per datasheet Section 6.6, RON must be selected to ensure ≥100 ns minimum on-time at 100 V input for stable COT operation.
Can the LM5017MR/NOPB operate without an external bootstrap capacitor?
No, the LM5017MR/NOPB requires a 0.01-μF ceramic capacitor between BST and SW pins for proper high-side gate drive. This capacitor is charged through the internal VCC-to-BST diode during SW low-time and supplies gate voltage during high-side conduction. Omitting it causes immediate failure of the high-side switch, resulting in no output regulation or potential thermal overstress.
What is the feedback reference voltage accuracy of the LM5017MR/NOPB?
The LM5017MR/NOPB features a precision 1.225 V internal feedback reference with ±2% tolerance over –40°C to +125°C junction temperature, as specified in Section 6.5 Electrical Characteristics of SNVS783K. This reference directly sets output voltage via the external RFB1/RFB2 divider and enables stable 3.3 V or 5 V generation with <±3% total output error including resistor tolerance and temperature drift.
LM5017MR/NOPB Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- -
- Package/Case:
- 8-PowerSOIC (0.154", 3.90mm Width)
- Packaging:
- Tube
- Product Status:
- Active
- Function:
- Step-Down
- Output Configuration:
- Positive
- Topology:
- Buck
- Output Type:
- Adjustable
- Number of Outputs:
- 1
- Voltage - Input (Min):
- 7.5V
- Voltage - Input (Max):
- 100V
- Voltage - Output (Min/Fixed):
- 1.225V
- Voltage - Output (Max):
- 90V
- Current - Output:
- 600mA
- Frequency - Switching:
- Adj to 1MHz
- Synchronous Rectifier:
- Yes
- Operating Temperature:
- -40°C ~ 125°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-SO PowerPad
LM5017MR/NOPB FAQ
1.How can I place an order for LM5017MR/NOPB through Aetrix?
Please submit a Request for Quotation (RFQ) for LM5017MR/NOPB on Aetrix. Our sales agent will provide a competitive quotation and guide you through the order confirmation once you accept the terms.
2.Are the price and stock information for LM5017MR/NOPB reliable?
The price and inventory of LM5017MR/NOPB are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LM5017MR/NOPB is usually 5 days.
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4.How is shipping managed for LM5017MR/NOPB?
LM5017MR/NOPB orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM5017MR/NOPB order is processed, you will receive an email with the shipment details and tracking number.
Note: Tracking information may take up to 24 hours to appear. Express delivery typically takes 3–5 business days.
5.How can I obtain technical support or documentation for LM5017MR/NOPB?
For technical support, including LM5017MR/NOPB datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM5017MR/NOPB requirements.
6.How does Aetrix verify that LM5017MR/NOPB is sourced from the original manufacturer or authorized distributors?
All LM5017MR/NOPB products on Aetrix are procured from qualified distributors and authorized channels. Our dedicated quality assurance team conducts strict verification, including traceability checks and, if necessary, third-party testing. This ensures that LM5017MR/NOPB meets industry standards.
7.What is the process for return or replacement of LM5017MR/NOPB?
All LM5017MR/NOPB units undergo pre-shipment inspection (PSI). If there is an issue with LM5017MR/NOPB, returns or replacements are accepted under the following conditions:
1.Quantity discrepancies, incorrect items, or visible external defects (such as breakage or corrosion), acknowledged by Aetrix.
2.The issue is reported within 90 days of delivery.
3.The LM5017MR/NOPB part is unused and in its original packaging.
Return procedure for LM5017MR/NOPB:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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